[Python-Dev] PEP 3147: PYC Repository Directories

Barry Warsaw barry at python.org
Sun Feb 7 19:04:30 CET 2010

On Jan 31, 2010, at 08:10 PM, Silke von Bargen wrote:

>Martin v. Löwis schrieb:
>> There is also the issue of race conditions with multiple simultaneous
>> accesses. The original format for the PEP had race conditions for
>> multiple simultaneous writers; ZIP will also have race conditions for
>> concurrent readers/writers (as any new writer will have to overwrite
>> the central directory, making the zip file temporarily unavailable -
>> unless they copy it, in which case we are back to writer/writer
>> races).
>> Regards,
>> Martin
>Good point. OTOH the probability for this to happen actually is very small.

And yet, when it does happen, it's probably a monster to debug and defend
against.   Unless we have a convincing cross-platform story for preventing
these race conditions, I think a single-file (e.g. zipfile) approach is

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 835 bytes
Desc: not available
URL: <http://mail.python.org/pipermail/python-dev/attachments/20100207/ad6d7f90/attachment.pgp>

More information about the Python-Dev mailing list